Device for measuring the elongation of filaments



Sept. 19, 1933. F. GERNERT 1,927,637

DEVICE FOR MEASURING THE ELONGATION OF FILAMENTS Filed Oct. 13, 1930 2 Shets-Sheet 1 r r I j 33 32 30 27 26' .20 18 1' Fz'yare 2.

W ATTORNEY Sept. 19, 1933. F. GERNERT 1,927,637

DEVICE FOR MEASURING THE ELONGATION OF FILAMENTS Filed Oct. 13, 1930 2 Sheets-Sheet 2 ATTORNE Patented Sept. 19, 1933 UNITED STATES DEVICE FOR MEASURING THE ELONGA- TION OF FILAMENTS Fritz Gernert, Wuppertal-Barmen, German assignor to American Bemberg Corporation, New York, N. Y., a corporation of Delaware Application October 13, 1930, Serial No. 488,368, and in Germany November 8, 1929 Claims. (01915-51) The invention relates to a device for measurin the permanent elongation at a high speed of elongation. The devices known up to the present time determine the elongation by inserting the 5 filament between two fixed points and slowly loading the same by means of weights or springs up to the breaking point. The amount of this elongation can be read from a calibrated dial.

The device described in this invention makesit possible to determine the elongation of the filament and which can be done at a high velocity. The filament is inserted between two points one of which is fastened on a movable rod which is reciprocated to and fro by springs in the amount of a pre-determined distance for the purpose of loading and unloading. The movement causing the elongation of the thread is actuated by a spring connected to the rod by means of tongs. In order to bring the rod back into the 0 original position, the tongs equipped with two levers are opened by throwing these levers into their final position, thereby freeing the rod. At the same time, a key fastened at the rod opens another tong which holds to other springs which 5 move by means of levers the rod back into its original position.

The measurements made possible by the above described device give the opportunity for determining important qualities of textile filaments. Furthermore, the device reduces the time required to make each test.

The attached drawings illustrate a preferred embodiment of this invention, wherein:

Figure #1 shows in a side elevation, partially in central cross-section, a spring actuated filament holder with the springs loaded.

Figure #2 shows the same device after the springs are unloaded.

Figure #3 shows a detail of the device illustrating the arrangement of the tongs.

Figure #4 shows a top plan view, partially in cross-section, the tongs disclosed in Figure #3.

The device consists of two brackets (2, 4)

5 initially arranged at a set, pre-determined distance from each other. One of these brackets (2), equipped with a small plate and a fastening screw, is mounted by means of the frame 1) to the bed plate (18), while the other bracket (4) is fastened to an adjustable rod (6) which is guided on four rollers ('7, '7, 11, 11). On the other end of the adjustable rod are located a pair of tongs pivotally mounted on the bolts (40, 40) which engage the bolt (13) which is fastened to the spring (15) by means of a butt strap. The bolt (13) is guided in slots (41) formed in the plates (14) (see Fig. 3) and is provided at each end with a handle (42) (see Fig. 4) projecting through the plates (14) The jaws (35, 36) (see Figs. 3 and 4) of the tongs (28) each carry at a right angle, the lever (12) to which are fastened springs (3'7) 09 which act to hold the tong jaws (35, 36) in their final or closed position. The other end of the spring (15) is fastened by means of bolt (16) (see Fig. 1) to the end of two plates (14, 14) arranged parallel to each other and which plates are, in turn, fastened to the side of the two frames (25, 30) and, by them, connected to the bed plate (18). One frame (25) is rigidly fastened to the bed plate (18), whereas, the other (30) can be moved along the guide (2'7) bymeans of the spindie (32) actuated by the crank (33) (see Fig. 1). During this movement, the plates (14) move in slots (26) on two bolts (24) fastened to the frame (25), which at the same time serve as bearings for the two rollers (11, 11) carrying the rod (6). The frame (30) however carries two stops (29) and is equipped with a bore (31) for allowing the passage of the spring (15). The rod (6) is made stationary against movement by the spring (15) through a pointer (19) that is inserted in a slot (43) in the rod (6) The pointer (19) is fastened to the frame (20) which carries two end plates (5) which serve the purpose of holding two return springs (9, 9). The other ends of these return springs (9) are fastened to a lever (23) guided by means of two rollers (22) on the rod (6). This lever is held in position by two tong jaws (10, 10) connected to one another by means of the spring (34). There is also provided a key (8) on rod (6) for the purpose of opening the tong jaws (10) and provision is made for a stop (21) for limiting the movement of the rod.

A scale (1'7) is arranged in the center between the two brackets (2, 4) which is equipped with a mirror for the purpose of observing the sag of the filament (3).

The filament (3) to be tested is tightly inserted between the brackets (2, 4) and the elevation of the filament (3) is read on scale (1'7). Then arrester (19) is loosened and rod (6) made free which will therefore instantaneously move to the left side because of the spring (15) until bolt (13) is stopped by the frame (30), which limits the left-hand movement. Shortly before the rod (6) arrives to its final position, two other motions are executed simultaneously. Tong levers (12) push against locking bolts (29) and therefore open tong (28) and free the rod (6). At the same time the key (8) fastened to the rod (6), pushes no against tong jaws (10) of the second tong and spreads those jaws apart by overcoming the tension of spring (34). Thereby,'the lever (23) is freed and allowed to move instantaneously back into its original position under the action of return springs (9). The original position is fixed by stop (21) because the lever (23) pushes against key (8).

The permanent elongation of the thread is ex= pressed by the fact that the filament (3) sags a definite amount, which sag can be considered proportionate to the elongation vThe distance representing the elongation of the thread is given by the distance of tong levers (12) fromlocking bolts (29) and can be varied by changing frame (30) carrying these locking bolts (29) by means of spindle (32) operated by the crank (33).

After each test, the springs have to be loaded.

again. For this purpose the bolt (13) fastened to the spring (15) is moved against the action of the spring by means of handle (42) (see Fig. 4) until it opens the tong moving along the oblique edges of tong jaws (35, 36) and is inserted behind the teeth under the action of the springs (37), thereby the spring (15) is loaded. Return sired that the scope of the invention be not limspring actuated means for moving one of the brackets, means for releasably holding the spring actuating means in operativeposition, said holdadapted to contact with said stop members at the end of movement of said rod'for releasing the same, and means for measuring the elongation imparted to said textile material.

3. A device as set forth in claim 2 including a mirror located between said brackets and behind the textile material to be measured for observing the amount of elongation imparted to said material.

4. A device for measuring the elongation of a filament comprising two brackets for holding the filament, one bracket being permanently fixed, a spring actuated rod to which the other bracket is attached, stop devices for limiting the movement of the rod, a pair of tong-like jaws associated with said rod and being operated by said stop devices, and spring members acting to return the rod to its original position thereby releasing the tension on the filament.

5. A device as outlined in claim 4 including a measuring device located between said brackets whereby the permanent elongation of the filament may be determined.

FRITZ GERNERT. 

